So basically what im getting out of most people is that the Vair is better  
in the long run as far as torque and power vs. weight and power. Subes 
might be  fine if I was just chugging around the southwest but I planned on 
long 
distance.  Thanks for all your opinions and links to help my decision.


David Swanson
Tucson AZ.


In a message dated 7/9/2009 8:36:10 A.M. US Mountain Standard Time,  
ste...@compositecooling.com writes:



Now as far as Subes being more efficient or economical than  Vairs you
need to try to compare apples to apples. If you are talking about  a
stock direct drive Subaru (not common) compared to a stock direct  drive
Corvair (common) I would say the Corvair would win out on the  horse
power, but much more importantly the torque value. Nothing wrong  with
the Sube it is just a fundamental design issue. The smaller  displacement
Sube was designed to create its power at a higher RPM outside  the range
of efficiency for aircraft propellers.

This is why most  but not all Subes use redrives. They allow the engine
to generate its power  at its rated RPM and the redrive allows the prop
to operate in the range  that it needs to. Now your power goes up, but so
does your fuel burn but  again and much more importantly your torque goes
way up depending on your  redrive ratio. There is also a weight penalty
that must be paid for both  liquid cooling and a redrive.  


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